

/* Copyright 1998 by the Massachusetts Institute of Technology.
 *
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting
 * documentation, and that the name of M.I.T. not be used in
 * advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 */

#include "ares_setup.h"
#include "ares_strdup.h"
#include "ares.h"
#include "ares_private.h"

char* ares_strdup(const char* s1)
{
#ifdef HAVE_STRDUP
    if (ares_malloc == malloc)
        return strdup(s1);
    else
#endif
    {
        size_t sz;
        char* s2;

        if (s1) {
            sz = strlen(s1);
            if (sz < (size_t)-1) {
                sz++;
                if (sz < ((size_t)-1) / sizeof(char)) {
                    s2 = ares_malloc(sz * sizeof(char));
                    if (s2) {
                        memcpy(s2, s1, sz * sizeof(char));
                        return s2;
                    }
                }
            }
        }
        return (char*)NULL;
    }
}
